The Cybex VR Classic Leg Extension is a commercially built machine that is designed to work the quadriceps muscles of the lower body. This machine has a selectorized weight stack with 200 lbs. that runs through a pulley system via a cable. This makes this machine very safe to use. It has an adjustable back pad to accommodate a wide range of user heights. There is a fixed seat pad. There is an exercise placard that shows the basic operation of the machine as well as the muscle groups involved. It has a very solid frame that is commercially built for durability in any multi use facility such as a health club, personal training or physical therapy studio, or busy home gym setting.